Malicious PDF — malware analysis report

Static analysis result for SHA-256 07944ea76a0f8d10…

MALICIOUS

PDF

88.0 KB Created: 2021-06-29 11:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dfdb31f002c7b3c1133946690e6d0dd9 SHA-1: 14c09c79ecbd44188b56ca79762455936a2bdfb9 SHA-256: 07944ea76a0f8d109eba62a7fb3610e76a7205a96e2f3129f37f503bf25bb621
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is likely used for phishing or malware distribution. No scripts were extracted, but the structure and heuristics point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://plkorea77.com/ckupload/files/86783504442.pdf In PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec8d3d190b---63299841375.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/segixu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34b98f0534---35053890694.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/bb9772fe35a9f20720680613339223ed/gezeredolemuw.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c1062b1eba4---17502080628.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a27680344c---sujekovumijuden.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1131f86784---34851735930.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/7202527505.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47e6a8881e---78170901401.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/2ft5nrlu1s1o4js1j54eo3tlr4/xotagi.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160781f1ed7237---85466652073.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/47234400316.pdfIn PDF document text
    • https://afayl.com/userfiles/file/savibux.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/0c2b3b91f1b3c45c69f904233a86aa25/buviwuwogekexexobite.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/hflu8bv4f0pi1e4t0hi3po4dd7/40450955788.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/nudurejixulijomaxol.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f6853a3c---xovij.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ffrdls0jmphl4rivcvqp6ajcsc/14453312216.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6293496748---sumadumatizogowizavaxamo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a97838a82f---14196581560.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc7e25ddac---72379183096.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/mifumumetuvemona.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/f589fb484cb88d84c96a4701c7e188c9/99094934297.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/49950631159.pdfIn PDF document text
    • https://nevisnews.com/userfiles/fisadawoj.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/48745613321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=evaluation+of+sustained+release+dosage+forms+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 17572 bytes
SHA-256: 524d2f49212f9dee94f044b8df6dde2fd5ee641e57693c0522b5bd13a46e80a1
font_02_sfnt_off000138e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E2 10988 bytes
SHA-256: 183652a2c94a516730a30777b603f1f05a782028dbaee057008579b9c5d2fcdd

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